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How would you confirm that a colourle...

How would you confirm that a colourless Liquid given to you is pure water?

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Take a sample of colourless liquid and put on stove if it starts boiling exactly at `100^(@)C` then it is pure water. Any other colourless liquid such as vinegar always has different boiling point. Also observe carefully that after some time whole liquid will convert into vapour without leaving any residue.
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